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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Statement of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Revenues $ 1,643 $ 1,430 $ 1,619
Non-controlling interests 395 320 373
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Revenues 1,643 1,430 1,619
Non-controlling interests 395 320 373
Other Comprehensive Income (loss) (81) (357) (12)
Net Income 288 162 235
Other Comprehensive Income (loss) (5) 15 245
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Revenues 569 488 478
Non-controlling interests 34 11 24
Other Comprehensive Income (loss) 6 42 71
Net Income 138 46 103
Other Comprehensive Income (loss) 26 167 278
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Revenues 1,074 942 1,141
Non-controlling interests 361 309 349
Other Comprehensive Income (loss) (87) (399) (83)
Net Income 150 116 132
Other Comprehensive Income (loss) $ (31) $ (152) $ (33)